Fix a mbuf leak where sc_start fails or the protocol is none.

Fix locking assert where we should hold the reader lock.

Fix unused variable error with !INET6

Reported by: Artem Naluzhny, Frank Terhaar-Yonkers

Feed ipv6 flowlabel to hash calculation.

Obtained from: NetBSD

Change from a mutex to a read/write lock. This allows the tx port to be
selected simultaneously by multiple senders and transmit/receive is not
serialised between aggregated interfaces.

- Correctly check if lp_ioctl is null
- Remove lagg_ether_purgemulti as its no longer needed
- Mark the interface as up if any ports are active rather than just the primary

The purgemulti call is not needed since all the ports have already been detached.

Call if_setlladdr() on the aggregation port from a taskqueue so the softc lock
is not held. The short delay between aggregating the port and setting the MAC
address is fine.

Avoid touching various unsafe parts if the interface is disappearing.

Change from using if_delmulti() to if_delmulti_ifma() as it simplifies the code
and is safe to use if the ifp has disappeared.

Suggested by: bms

- Add a disabled state for ports that can not be aggregated
- Refine check for lacp links, set to disabled if not suitable

Set the master flag on the right variable.

Rename the trunk(4) driver to lagg(4) as it is too similar to vlan trunking.

The name trunk is misused as the networking term trunk means carrying multiple
VLANs over a single connection. The IEEE s

Rename the trunk(4) driver to lagg(4) as it is too similar to vlan trunking.

The name trunk is misused as the networking term trunk means carrying multiple
VLANs over a single connection. The IEEE standard for link aggregation (802.3
section 3) does not talk about 'trunk' at all while it is used throughout IEEE
802.1Q in describing vlans.

The lagg(4) driver provides link aggregation, failover and fault tolerance.

Discussed on: current@

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